So... we have been asked a couple of times for advice for driving to Central America.  What were our favourite places?  It's a very general question, but since I just summarized it for an email and I'll just go ahead and copy/paste it here.  
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The two biggest pieces of advice for 
navigation would be to use the Skobbler GPS app (about $10 with unlimited world maps) and the iOverlander.com app.  Both work offline without cell service.  Combine those with paper maps and you'll never get stressed out about finding a place to sleep or figuring out how to get there. 
 
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These are mostly roads off of the beaten path that we had a blast on.  Each are between 1-3 days of driving.
 
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Let the rambling commence!
 
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Baja California 
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Our general route is mapped out here: 
 
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http://desktoglory.com/baja-california-summary-39-days-in-paradise-for-1386/  
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All of the places we stayed are now on iOverlander (input by Song of the Road).
 
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We especially likeed our extended beach stays at Gonzaga Bay, El Coyote, and La Gringa (Bay of L.A.)
 
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These were a few fun routes:
 
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South along "Highway 5" (really just a washboard/rocky track) from Gonzaga Bay (we camped at 29.788538, -114.394978, see 
http://desktoglory.com/bahia-san-luis-gonzaga/ for pictures) to Coco's Corner N29 31.032 W114 17.464 (Sorry for the different types of coordinates) to Highway 1.  Approx 70km at 15km/h.  Worth a stop at Coco's. 
 
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The road west from Loreto to San Javier Mission and then continuing west to Highway 53 We camped along a river at 25.634817, -111.619478 (Don't let the kid with the machete scare you off). We were there a few weeks after a big storm.  A lot of the road was washed out and required about five water crossings (max was 18" deep when we were there Dec 2013).  
http://desktoglory.com/missions-mudbaths-and-machetes/
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Cabo San Lucas north-east along the coast to Cabo Pulmo and then back up to La Paz was great as well.
 
http://desktoglory.com/cabo-san-lucas-lands-end-and-the-east-cape/
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Mainland Mexico
 
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We didn't explore too much off of the main roads in Mainland Mexico, but we really regret not spending any time at the Copper Canyon after seeing photos from others.
 
 
 
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In Oaxaca we did get to spend some time in the Pueblos Mancommunados and Benito Juarez.  Great views from Benito Juarez and nearby hikes 
http://desktoglory.com/oaxaca-and-the-pueblos-mancommunados/.
 
 
 
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It might be fun to head through Mexico City: 
http://desktoglory.com/mexico-city-i-want-to-ride-my-bicycle/
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...stop at the Teotihuacan Pyramids:  
http://desktoglory.com/teotihuacan-pyramids/
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...or stop in Palenque:  
http://desktoglory.com/palenque-welcome-to-the-jungle/
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The Yucatan Peninsula will definitely be the most expensive part of the trip, but the beaches are of the nicest we saw.  
http://desktoglory.com/the-oliver-family-visits-the-yucatan/
 
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Belize 
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Our first day we drove to Sartejena and camped at the Backpackers Paradise Hostel.  We left our truck here for three days when we took a water taxi to Caye Caulker.  
http://desktoglory.com/caye-caulker/
 
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The Coastal Highway from The Belize Zoo (we didn't go here, just using as a reference) south to where it connects to the Hummingbird Highway had great scenery.  Fast dirt roads and two-track.  Averaged 70-80 km/h on the dirt here.  Definitely a fun road. 
http://desktoglory.com/the-road-to-hopkins-village/
 
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Take the Hummingbird Highway up to Spanish Lookout and be in awe of what looks like middle-America.  Lots of Americans have relocated here and it'll feel like you're back home.  The Sunset Diner (I think that's the name) food truck has wicked burgers which were a nice change from rice and beans. We explored the Pine Ridge Mountain Forest Reserve (just west of Spanish Lookout) for a few days.
 
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http://desktoglory.com/mountain-pine-ridge-forest-reserve/
 
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Guatemala
 
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Tikal is a must-see.  
http://desktoglory.com/goodbye-belize-hola-guatemala-tikal-ruins/
 
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The road (Highway 7 or 7E) from Rio Dulce to Coban and then to Lanquin was spectacular.  The following day we drove from Lanquin to Semuc Champey.  Mostly on dirt roads.  One of the top 3 drives of our trip. 
http://desktoglory.com/lanquin-and-semuc-champey/ 
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Costa Rica
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The Nicoya Peninsula was another one of our favourite routes.  Hwy 160 (30km/h dirt roads) south from Tamarindo to Montezuma took a couple of slow days.  We were there just before rainy season and only had a couple of small water crossings to deal with.  Most of the road parallels the coast so there's always something nice to look at.  
http://desktoglory.com/nicoya-peninsula-costa-rica/